Precision engineering tools designed for technical drafting and mathematical applications. This comprehensive set includes both 45-degree and 60-degree set squares, each measuring 10cm, enabling accurate angle construction and geometric drawing. Manufactured to professional standards, these transparent instruments feature clear graduations for exact measurements. Ideal for architects, engineers, students, and technical professionals who demand reliability in their drafting work. The Trefoil brand ensures durability and consistent performance across multiple projects and applications.